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  Interceptor along the Emscher – Successful implementation of a major project for the structural transformation in the Ruhr area using the smallest EPB TBM in the world

  A railway station in the south, an airport in the east and a philharmonic hall in the north – in the course of the debate on these projects gained the impression Germany couldn´t manage major projects. A look to the west shows that´s not true: The Water Management Association Emschergenossenschaft plans and implements the conversion of the mega project Emscherrenaturation since 1992. Approximately 4.5 billion Euros will be invested in this major public project. Even after 20 years, it is still in time and budget. The Emscher is the central river in the Ruhr area and nowadays mostly an open wastewater sewer. To fully rehabilitate the river a new 400 km long subterranean sewer is constructed – partially in a depth of 40 m. The 2x10 km long section BA40 is an essential component of the environmental protection project of European magnitude. It is carried out using two EPB-shields. The construction is much determined by the extremely restricted space available owing to the internal tunnel diameter of 2.6 m, which surely represents the lower limit for tunneling using the segmental lining method. In consequence solutions had to be found for the problems linked to the small size and extensive safety technology measures were put in place.

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